Using street view, you can often see "Social Security" on a building or sign.

Social Security Office Directions and Notes :

OFFICE IS LOCATED AT 1415 FRANKLIN GATEWAY SE NEAR THE CORNER OF FRANLKIN GATEWAY SE AND COBB PARKWAY, BEHIND PEP BOYS.

Marietta Social Security Office Notes

Social Security offices have seen their hours reduced the past few years.
Almost all Social Security offices are open 9:00 to 4:00, except
for 9:00 to noon on Wednesdays. Call to see if you can get an
appointment by phone first. Fridays may have more appointments
available. Try doing things online like applying for disability benefits
at ssa.gov.